I bought the amp from Orvac Electronics Inc. Fullerton, California
http://www.orvac.com/specials/index.htmlNot much of an on-line presence. They do not seem sell it on-line
The amp info is:
pro stuff Electronics
amp-100
300 watts
2 channel mini amplifier
I couldn't find it on-line anywhere
I rechecked for any hum and could not really hear any. Sounds fairly clean to me.
I am using a separate 450 watt power supply for the amp only, maybe that's the difference, avoiding any noise from the computer components. The only other thing I can think of, are any of the audio signal wires running parallel to any A/C voltage wires which might cause a cycle hum. As a novice that's the best I can come up with, sorry.